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Superconducting Bi-Ca-Sr-Cu-0 Films by RF Magnetron Sputtering
並列摘要
Thin films of high-Tc superconductor were prepared by RF magnetron sputtering from sintered Bi-Ca-Sr-Cu-0 targets. The effects of annealing conditions on the superconducting properties of the films were studied. Films with a sharp transition were obtained by sintering films at about 860°C. The resistivity shows an anomaly in the high temperature ranges 420 K ＜ T Q 630 K. This anomaly is similar to that observed in bulk Bi-Ca-Sr-Cu-0 samples. Pb doped Bi-Ca-Sr-Cu-0 films show a sharp superconducting transition with Tc(50%) = 82 K and a zero resistance at 77 K. The critical current density is about 5 X 10^3 A/ cm^2 at the reduced temperature t = 0.9 for Pb doped films, where t = T/T, and Tc(50%) = 82K.
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